Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

World Health Organisation will know if Zika virus causes microcephaly within weeks

The World Health Organization said today that it will know in a matter of weeks whether the Zika virus causes a serious illness which affects unborn babies and the severe neurological disorder Guillain-Barre syndrome.

The UN health agency's deputy director for health systems and innovation, Marie-Paule Kieny, said it would likely take four to eight weeks to establish whether there is a causal relationship between the conditions.

Two pregnant women in Australia have been diagnosed with the Zika virus. (AAP)

While most people infected with Zika have only mild symptoms, the virus is strongly suspected of being linked with microcephaly, which can cause babies to be born with abnormally small heads and brains, and Guillain-Barre, a disorder that can cause paralysis or even death.

A pregnant woman in Victoria has been diagnosed with the virus after returning from a country where the virus is prevalent, Health Minister Jill Hennessy confirmed today.

Another pregnant woman tested positive for the virus in south-east Queensland earlier this week. Hers was the third in the state in 2016.